aMaze has some great potential, but for the time being it just doesnt work properly on BBs. Too much lag time in loading data and the map data is quite inaccurate here in the midwestern US.

For what it's worth I have also used both Telenav and Mapquest Navigator, and although Telenav is a excellent application I have chosen Mapquest as my Navigation Guide. I like the colors on the maps better than Telenav's (for me it's easier to distinguish the route) and Mapquest downloads a corridor of information onto your Blackberry and stores it for reference during your travels, so if you go into an area that data service is not available you will still have your maps (providing you do not shut off your phone or close the mapquest application). Telenav does not do this, it requires data connection at all times. Also Mapquest's pricing is half of Telenav's, so for my personal needs Mapquest is the Application of choice.